Abstract: An electronic cash register comprises a control switch for allowing and prohibiting printing and issuance of a receipt according to input data introduced by input keys and a delay circuit for deferring operation of the control switch for a predetermined period of time of the actuation of the control switch. The delay circuit provides accurate control for the allowance and prohibition of receipt printing and issuing operation independently of actuation timings when the control switch is energized, thereby preventing random printing and publication of the receipt dependently on the timed relationship of actuation of the control switch.

Abstract: Only one lockable key switch is provided to which plural kinds of operator clerk keys held by cashiers and a master clerk key held by an administrator are inserted. The lockable key switch develops a signal representative of the inserted clerk key for identifying a cashier operating the electronic cash register. Nonlockable switches are formed on a keyboard panel for introducing a clerk specifying signal when the master clerk key is inserted into the lockable key switch.